I'm going to gently suggest that until you're comfortable drawing human bodies from life, you should stay away from the 3D models, especially for complicated stuff like multiple bodies interacting. Human bodies are dynamic - many joints can shift up or down depending on the movement; they never articulate through just one joint, as every movement typically causes a ripple effect through the rest of your body as your brain re-adjusts your balance and posture. 3D models do not have this feedback, and their skeleton is usually much more rigid than a human body, not allowing joints (like the shoulder joint, which is part of a girdle that sits over your rib cage) to move to accommodate flexing muscle etc. 3D models are a useful tool when you know how to draw a body freehand, and just let the model stand in for the rough sketch, which you then adjust for inconsistencies. But they will make learning to draw better - more dynamic, more natural interactions - really, REALLY hard if you don't know what to look for.
Here's a reference image instead (from google image query "men walking hand on shoulder"):


Notice how the center of balance - and gravity - for both men is closer to the other man, compared to where it would normally be if they were standing alone? That's because standing with your arm out (to place on another person's shoulder) actually throws your off-balance, so you naturally lean into that shoulder to re-distribute some of the weight. You can also see that the shoulders of the man with his arm across the shoulders of the other are also canted, as the shoulder joint itself rides up a little bit as the muscles moving it flex.
If you're stuck on a pose, it's always better to find a reference photo, or ask someone to help you pose (I have lots of photos and videos of my husband sitting, standing, getting up from an awkward angle, etc). You can go back to the 3D models once you feel comfortable with their limitations.